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Pressure ulcers, also sometimes known as bedsores or pressure sores, are a type of injury that affects areas of the skin and underlying tissue. They are caused when the affected area of skin is placed under too much pressure.
Pressure ulcers can range in severity from patches of discoloured skin to open wounds that expose the underlying bone or muscle.
How pressure ulcers develop
Pressure ulcers develop when a large amount of pressure is applied to an area of skin over a short period of time. Or, they can occur when less force is applied but over a longer period of time.
The extra pressure disrupts the flow of blood through the skin. Without a blood supply, the affected area of skin becomes starved of oxygen and nutrients. It begins to break down, leading to the formation of an ulcer.
Healthy people do not get pressure ulcers because they are continuously and subconsciously adjusting their posture and position so that no part of their body is subjected to excessive pressure.
However, people with health conditions that make it difficult for them to move their body often develop pressure ulcers. In addition, conditions that can affect the flow of blood through the body, such as type 2 diabetes, can make a person more vulnerable to pressure ulcers.
See Pressure ulcers - causes for more information about the risk factors that are associated with the condition.
How common are pressure ulcers?
Pressure ulcers are a widespread and often underestimated health problem in the UK and across the world.
It is estimated that just under half a million people in the UK will develop at least one pressure ulcer in any given year. This is usually people with an underlying health condition. For example, around 1 in 20 people who are admitted to hospital with an acute (sudden) illness will develop a pressure ulcer.
People over 70 years old are particularly vulnerable to pressure ulcers due to a combination of factors, such as:
Two out of every three cases of pressure ulcers develop in people who are 70 years old or more.
Preventing pressure ulcers
Pressure ulcers can be unpleasant, upsetting and challenging to treat. Therefore, healthcare professionals use a range of techniques that are designed to prevent pressure ulcers developing in the first place. These include:
Unfortunately, even with the highest standards of clinical care, it is not always possible to prevent pressure ulcers in particularly vulnerable people.
The outlook for someone with pressure ulcers will vary widely among individuals.
For some people, pressure ulcers are a minor inconvenience that require minor nursing care. For others, they are a very serious type of injury that can lead to life-threatening complications, such as blood poisoning or gangrene (a condition where the body’s tissue begins to decay and die).
Treatment for pressure ulcers includes the use of dressings, creams and gels that are designed to speed up the healing process and relieve pressure. For the most serious cases, surgery is sometimes recommended.
The parts of the body most at risk of developing pressure ulcers are those that are not covered by a high amount of body fat and are in direct contact with a supporting surface, such as a bed or a wheelchair.
For example, if you are bedbound (unable to get out of bed) you are at risk of developing pressure ulcers on your:
If you are a wheelchair user, you are at risk of developing pressure ulcers on:
Grading of pressure ulcers
Healthcare professionals use several grading systems to describe the severity of pressure ulcers. The most common is the European Pressure Ulcer (EUPAP) Grading System. The higher the grade, the more severe the injury to the skin and underlying tissue.
A grade one pressure ulcer is the most superficial type of ulcer. The affected area of skin appears discoloured and is red in white people, and purple or blue in people with darker coloured skin.
In grade one pressure ulcers, the skin remains intact but it may hurt or itch and it may feel either warm and spongy, or hard.
In grade two pressure ulcers, some of the outer surface of the skin (the epidermis) or the deeper layer of skin (the dermis) is damaged, leading to skin loss. The ulcer looks like an open wound or a blister.
In grade three pressure ulcers, skin loss occurs throughout the entire thickness of the skin. The underlying tissue is also damaged. However, the underlying muscle and bone are not damaged. The ulcer appears as a deep cavity-like wound.
A grade four pressure ulcer is the most severe type of pressure ulcer. The skin is severely damaged and the surrounding tissue begins to die (tissue necrosis). The underlying muscles or bone may also be damaged.
People with grade four pressure ulcers have a high risk of developing a life-threatening infection.
Pressure ulcers develop when sustained pressure is placed on a particular part of the body and interrupts the blood supply to that part of the body.
Blood contains oxygen and other nutrients that are needed to help keep tissue healthy. Without a constant blood supply, tissue damage occurs and the tissue will eventually die.
The lack of blood supply means that the skin no longer receives infection-fighting white blood cells. Once an ulcer has developed, it can become infected by bacteria.
People with normal mobility do not develop pressure ulcers as their body automatically makes hundreds of regular movements that prevent pressure building up on any part of their body.
For example, while you are asleep you may think you are lying still, but you may shift position up to 20 times a night.
The risk factors for pressure ulcers can be divided into one of two categories:
In some cases, a person may have both intrinsic and extrinsic risk factors, which are discussed in more detail below.
Intrinsic risk factors
Intrinsic risk factors for pressure ulcers include:
Possible reasons for having a mobility problem are:
Reasons that your diet may lack nutrition include:
Health conditions that can make you more vulnerable to pressure ulcers include:
There are several reasons why ageing skin is more vulnerable to pressure ulcers. These include:
Both urinary incontinence (inability to control your bladder) and bowel incontinence (inability to control your bowels) can cause certain areas of the skin to become moist and vulnerable to infection. This can trigger pressure ulcers to form.
Mental health conditions
People with severe mental health conditions such as schizophrenia (a condition where people have problems telling the difference between reality and imagination) or severe depression have an increased risk of pressure ulcers for a number of reasons:
Extrinsic risk factors
Extrinsic risk factors for pressure ulcers include:
The time it takes for a pressure ulcer to form will depend on:
Grade three or four pressure ulcers can develop over short time periods. For example, in susceptible people, a full-thickness pressure ulcer can sometimes develop in just one or two hours. However, in some cases the damage will only become apparent a few days after the injury has occurred.
Diagnosing pressure ulcers
As part of the risk assessment process, the healthcare professionals who are involved in your care will consider:
As part of the risk assessment, you may be referred for blood and urine tests. Blood tests can be a good way of assessing your general state of health and whether your diet is providing enough nutrition.
Urine tests can be used to check how well your kidneys are working and whether you have a urinary tract infection, which is an infection of the kidneys, bladder or urethra (tube between the bladder and the penis or vulva, through which urine is passed). These types of infection can be a cause of concern if you are incontinent or if you have had spinal damage.
If you are thought to be at risk of developing pressure ulcers but you are not currently staying in a hospital or care home, you may be advised to carry out regular daily checks for evidence of the early signs of the condition.
Look out for areas of discoloration and patches of skin that feel unusually spongy or tough to the touch. Use a mirror to check parts of your body that can be difficult to see, such as your back or buttocks. Contact your GP or your healthcare team if you notice any possible signs of damage.
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Your care team
Pressure ulcers are a complex health problem arising from many interrelated factors. Therefore, your care may be provided by a team that is made up of different types of healthcare professionals. This type of team is sometimes known as a multidisciplinary team (MDT).
Your MDT may include:
It is important to avoid putting pressure on areas that are vulnerable to pressure ulcers or where pressure ulcers have already formed. Moving and regularly changing your position helps to:
After your risk assessment is completed, your care team will draw up a ‘repositioning timetable’, which states how often you need to be moved. For some people, this may be as often as once every 15 minutes. Others may need to be moved only once every two hours.
The risk assessment will also consider the most effective way to avoid putting any vulnerable areas of skin under pressure whenever possible.
A nurse or physical therapist may also give you training and advice about:
Mattresses and cushions
There are a range of special mattresses and cushions that can relieve pressure on vulnerable parts of the body. Your care team will discuss the types of mattresses and cushions that are most suitable for you.
People who are thought to be at risk of developing pressure ulcers, or who have pre-existing grade one or two pressure ulcers, usually benefit from resting on a specially designed foam mattress, which relieves the pressure on their body.
People with a grade three or four pressure ulcer will require a more sophisticated mattress or bed system. For example, there are mattresses that can be connected to a constant flow of air, which is automatically regulated to reduce pressure as and when required.
Specially designed dressings and bandages can be used to protect pressure ulcers and speed up the healing process. Examples of these types of dressing include:
Topical preparations, such as cream and ointments, can be used to help speed up the healing process and also prevent further tissue damage.
If you have a pressure ulcer, you will not routinely be prescribed antibiotics. Antibiotics are usually only prescribed to treat an infected pressure ulcer and prevent the infection from spreading.
Antiseptic cream may also be applied directly to pressure ulcers to clear out any bacteria that may be present.
Certain dietary supplements, such as protein, zinc and vitamin C, have been shown to accelerate wound healing.
If your diet lacks these vitamins and minerals, your skin may be more vulnerable to developing pressure ulcers. As a result of this, you may be referred to a dietician so that a suitable dietary plan can be drawn up for you.
In some cases, it may be necessary to remove dead tissue from the ulcer to help stimulate the healing process. This procedure is known as debridement.
If there is a small amount of dead tissue, it may be possible to remove it using specially designed dressings and paste. Larger amounts of dead tissue may be removed using mechanical means. Some mechanical debridement techniques include:
A local anaesthetic will be used to numb the area of skin and tissue around the ulcer so that debridement does not cause any pain or discomfort.
Maggot therapy, also known as larvae therapy, is an alternative method of debridement. Maggots are ideal for debridement because they feed on dead and infected tissue without touching healthy tissue. They also help to fight infection by releasing substances that kill bacteria and stimulate the healing process.
During maggot therapy, the maggots are mixed into a wound dressing and the area is covered with gauze. After a few days, the dressing is taken off and the maggots are removed.
Many people may find the idea of maggot therapy off-putting but research has found that it is often more effective than more traditional methods of debridement.
Sometimes, it may not be possible for a grade three or four pressure ulcer to heal. In such cases, surgery will be required to seal the wound and prevent any further tissue damage occurring.
Surgical treatment involves cleaning the wound and closing it by bringing together the edges of the wound (direct closure) or by using tissue moved from a nearby part of the body (flap reconstruction).
Pressure ulcer surgery can be challenging, especially because most people who have the procedure are already in a poor state of health. As a result of the risk factors, a large number of possible complications can occur after surgery, including:
Despite the risks, surgery is often a clinical necessity to prevent life-threatening complications of pressure ulcers developing. Such complications include blood poisoning and gangrene (the decay or death of living tissue).
Even with the best possible medical care, complications, which can be occasionally life-threatening, can arise from grade three or grade four pressure ulcers. These complications are discussed below.
Infection can spread from the site of the pressure ulcer to a deeper layer of skin. This type of infection is called cellulitis. It causes symptoms of pain and redness, plus swelling of the skin. It will need to be treated with a course of antibiotics.
See the A-Z topic about Cellulitis for more information.
Left untreated, there is a risk that the infection can spread to the blood (see below) or the underlying bone or joint. In rare cases where pressure ulcers involve the lower back, tail bone and spine, the pressure ulcer can spread to the membranes that surround the spine and brain. This is known as meningitis.
If a person with a weak immune system has a pressure ulcer that becomes infected, there is a risk that the infection will spread into their blood and other organs. This is known as blood poisoning, or septicaemia.
In the most serious cases of blood poisoning, damage to multiple organs can lead to a large drop in blood pressure, known as septic shock. Septic shock can be fatal. Symptoms include cold skin and an increased heart beat.
Blood poisoning is a medical emergency. It requires immediate treatment in an intensive care unit (ICU) so that the functions of the body can be supported while the infection is treated with antibiotics or antiviral medication.
See the A-Z topic about Blood poisoning for more information.
Bone and joint infection
Infection can also spread from a pressure ulcer into underlying joints (septic arthritis) and bones (osteomyelitis).
Both of these infections can damage the cartilage, tissue and bone. They may also affect the functioning of the joints and limbs.
Antibiotics are required to treat bone and joint infections. In the most serious of cases, infected bones and joints may need to be surgically removed.
Necrotizing fasciitis, commonly known as ‘flesh-eating’ bacteria, is a serious skin infection that causes rapid tissue death. It can occur when a pressure ulcer becomes infected with a type of bacteria called group A streptococcus bacteria.
Emergency treatment is required. It involves a combination of antibiotics and surgical debridement of the dead tissue.
Gas gangrene is a serious but rare form of infection that occurs when a pressure ulcer becomes infected with the clostridium bacteria. The bacteria thrive in environments where there is little or no oxygen. They produce gases and release dangerous toxins. Symptoms of gas gangrene include severe pain and rapid swelling of the skin.
Gas gangrene requires immediate treatment with surgical debridement. In the most serious of cases, it may be necessary to amputate the affected body part to prevent the gangrene from spreading to the rest of the body.
See the A-Z topic about Gangrene for more information^^ Back to top
As part of your treatment plan, your care team will discuss with you the best way to prevent pressure ulcers. This will be based on your individual circumstances. However, you may find that the general advice outlined below is helpful.
Making regular and frequent changes to your position is one of the most effective ways of preventing pressure ulcers. If a pressure ulcer has already developed, regularly changing position will help to avoid putting further pressure on it, and give the wound the best chance of healing.
As a general rule, wheelchair users will need to change their position at least once every 15 to 30 minutes. People who are confined to bed will need to change their position at least once every two hours.
Once you have developed a pressure ulcer, it is important that you minimize or avoid putting any further pressure on it to give the wound the best chance of healing.
If you are unable to change position yourself, a carer or relative will need to assist you. See Pressure ulcers - treatment for more information and advice about positional changes.
Eating a healthy, balanced diet that contains an adequate amount of protein and a good variety of vitamins and minerals can help to prevent skin damage and speed up the healing process. You may be referred to a dietician so that a dietary plan can be drawn up for you.
If you currently have a reduced appetite due to a pre-existing health condition, the advice listed below may be useful.
See the A-Z topic about Diet for information and advice.
Checking your skin
If you have known risk factors for pressure ulcers, it is important that you check your skin on a daily basis for any signs of pressure ulcers, such as discoloured areas of skin. This is particularly important if you have an underlying condition, such as nerve damage or diabetes, which may dampen or numb feelings of pain in certain parts of your body.
You can use a mirror to check the parts of your body that are difficult to see, such as your bottom and the heels of your feet. If you notice any damage, report it to your care team. If you are at home, contact your GP or community nurse. If you are in hospital or a nursing home, inform one of your nurses or carers.
If you are a smoker, giving up is one of the most effective ways of preventing pressure ulcers. Smoking reduces the levels of oxygen in your blood. It also weakens your immune system, which increases your risk of developing pressure ulcers.
See the A-Z topic about Quitting smoking for further information and advice about giving up smoking.
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